Plate-holder for printing-presses.



" a c. w. HARR TE HOLDER FOR PR G PRESSESP PPLICATION FILED MAY 7,1914.1,168,498, Patented Jan. 18, 1916.

CHARLES W. HARROLD, OF WARREN, OHIO, ASSIGNOR TO THE HARRIS AUTOMATICPRESS COMPANY, OF NILES, OHIO,

A CORPORATION OF OHIO.

PLATE-HOLDER FOR PRINTING-PRESSES.

LifidAdid.

Specification of Letters Patent.

Patented Jan. is, rare.

Application filed May 7, 1914. Serial No. 836,985.

- clare the following to be a full, clear, and

exact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

The primary object of this invention is to provide means forfacilitating the attachment of plates to and their removal from theplate holders of printing-presses.

In the accompanying drawings, Figure l is an enlarged view of a portionof a printing-press cylinder showing my. present improvement. Fig. 2 isa plan view of one of the clamping members.

Referring to the drawings, 1 designates a rod which is mounted in theplate-carrier,

which latter in the present instance is shown as a cylinder 2, but mypresent improvement may be applied to any form of plate-carrier.

On rod 1 I mount the means for clamping the plate. In the drawings Ihave shown a single clamping member in each figure, but

- it will be understood that in actual practice v is slidabletransversely a series of clamping members is employed.

3 designates an arm mounted on rod 1 and having a widened head 1 formedwith an opening 5 extending longitudinally thereof, said opening beingwedgeshape with its reduced end terminating at one side of the head.Preferably the inner wall 6 of the opening is inclined, or set at anangle to the outer straight wall 7 Extending longitudinally through thewedge-shape opening is a binding element 8, which is shown in the formof a roll, which when moved toward the reduced end of the opening willbind the plate therein. This roll is preferably carried by a block 9which of the opening, which latter is grooved at its center, in itsinclined wall 6, to accommodate such block. A spring 10 acting on block9 serves to normally hold roll 8 in its plate-binding position, that is,at the reduced end of the wedgeshape opening. The block 9 has a rod 12extending therefrom and projecting through an opening in the head andbeyond one face of the latter. Any suitable means may be W. HARROLD,

spring acting on the employed whereby this rod may be manipu-- lated toovercome the tension of spring 10 and cause roll 8 to be moved out ofclamping position. I have shown a pivoted plate or lever 13 for thispurpose. A slight tap on the lever will release the bind of the roll onthe plate. Each of the supporting arms 3 is provided with a screw li bymeans of which the arm as a whole may be moved to place the plate undertension.

In practice, the operator by manipulating lever 13 draws the roll 8tothe widened end of opening 5 to allow the printing plate a: to beinserted between the roll and the straight wall 7 of the opening.Immediately upon releasing his hold on lever 13 the roll into thereduced portion of the opening and thus firmly bind the plate therein.After the plate has been thus secured to all the supporting arms thenecessary tension may be applied to the plate by means of screws 14.

The advantages of my present invention will be readily appreciated. Itwill be seen that the attachment andremoval of a plate may be easilyeffected in a very short time.

I claim as my invention:

1. A plate holder for printing-presses comprising a support having awedge-shape opening, a sliding block movable transversely of saidopening, a binding roll carried by said block, a spring serving to holdsaid block and roll at the reduced end of said opening, a rod extendingfrom said block, and a lever engaging said rod for moving said block androll as against the tension of said spring. 1

2. A plate holder for printing-presses comprising a support having awedge-shape opening, a block movable transversely of said opening, and awedging roll having a reduced portion mounted on said block, said rolland block being movable toward and away from the reduced portion of saidopening.

In testimony whereof, I have slgned this specification in the presenceof two subscribing witnesses.

CHARLES W. HARROLD. Witnesses:

C. G. PRITCHARD, A. D. Loor.

block will force the

